:root {
    --background: #ffffff;
    --text: #1a1a1a;
    --heading: #000000;
    --border: #ccc;
    --link: #0066cc;
}

@media (prefers-color-scheme: dark) {
    :root {
        --background: #121212;
        --text: #e0e0e0;
        --heading: #ffffff;
        --border: #444;
        --link: #4da6ff;
    }
}

body {
    background-color: var(--background);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

h1, h2 {
    color: var(--heading);
}

h1 {
    border-bottom: 2px solid var(--border);
    padding-bottom: 0.3em;
    margin-bottom: 1em;
}

h2 {
    margin-top: 2em;
}

h3 {
    margin-top: 1.5em;
}

ul {
    padding-left: 1.2em;
}

a {
    color: var(--link);
    text-decoration: underline;
}

strong {
    font-weight: bold;
}

em {
    font-style: italic;
}